WO2011129223A1 - 電力変換装置 - Google Patents

電力変換装置 Download PDF

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Publication number
WO2011129223A1
WO2011129223A1 PCT/JP2011/058567 JP2011058567W WO2011129223A1 WO 2011129223 A1 WO2011129223 A1 WO 2011129223A1 JP 2011058567 W JP2011058567 W JP 2011058567W WO 2011129223 A1 WO2011129223 A1 WO 2011129223A1
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WO
WIPO (PCT)
Prior art keywords
phase
current
voltage
cluster
power conversion
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Ceased
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PCT/JP2011/058567
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English (en)
French (fr)
Japanese (ja)
Inventor
井上　重徳
加藤　修治
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Hitachi Ltd
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Hitachi Ltd
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Priority to CN201180018422.6A priority Critical patent/CN102822763B/zh
Priority to EP11768744A priority patent/EP2560065A1/en
Publication of WO2011129223A1 publication Critical patent/WO2011129223A1/ja
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control having reactive elements actively controlled by bridge converters, e.g. active filters or static compensators [STATCOM]
    • H02J3/1857—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control having reactive elements actively controlled by bridge converters, e.g. active filters or static compensators [STATCOM] the bridge converters being multilevel bridge converters or modular multilevel converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/20—Active power filtering [APF]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks

Definitions

  • the present invention relates to a power conversion device, and more particularly to a three-phase power conversion device configured with three clusters including a serial body of one or a plurality of unit cells.
  • Cascade multi-level converter (hereinafter referred to as CMC) uses switching elements that can be turned on and off, such as Insulated Gate Bipolar Transistors (hereinafter referred to as IGBTs), and outputs a voltage that exceeds the breakdown voltage of the switching elements. It is a circuit system that can.
  • the CMC is configured by star connection of three series bodies of clusters and reactors, which are series bodies of a plurality of unit cells.
  • each unit cell is a single-phase full-bridge circuit, and includes a plurality of switching elements and a DC capacitor.
  • the unit cell outputs a voltage across the DC capacitor (hereinafter referred to as a DC voltage), a voltage having the opposite polarity of the DC voltage, or a zero voltage by controlling on / off of the switching element.
  • each cluster is a serial body of one or more unit cells
  • the output voltage of each cluster (hereinafter referred to as cluster voltage) is the sum of the output voltages of one or more unit cells included in the cluster.
  • the cluster voltage can be made a multilevel waveform by appropriately shifting the switching timing of each unit cell in the cluster. Therefore, the harmonic component of the cluster voltage can be reduced by increasing the number of unit cells included in each cluster.
  • Non-Patent Document 1 shows an experimental result of a self-excited reactive power compensator (hereinafter referred to as CMC-STATCOM) based on CMC, in which CMC is connected to a power system.
  • CMC-STATCOM self-excited reactive power compensator
  • system voltage When an unbalanced load such as an arc furnace is connected to the power system, an unbalanced voltage drop occurs in the impedance of the power system due to the reverse-phase current flowing out of the unbalanced load. This causes an imbalance in voltage (hereinafter referred to as system voltage).
  • a power converter is connected in the vicinity of the unbalanced load, and the reversed-phase current and the reversed-phase current of the unbalanced load are There is a way to output.
  • Non-Patent Document 1 discloses an experimental result in which CMC-STATCOM outputs only a positive-phase reactive current, and does not disclose a circuit method or a control method in the case of outputting a negative-phase current.
  • the present invention provides the following solutions.
  • the present invention relates to power conversion in which a delta connection cascade multilevel converter (CMC) configured by delta connection of a series body of a cluster and a reactor, which is a series body of one or a plurality of unit cells, is connected to a power system.
  • CMC delta connection cascade multilevel converter
  • the present invention links a delta connection cascade multilevel converter (CMC) configured by delta connection of a series body of a cluster and a reactor, which is a series body of one or a plurality of unit cells, to a power system.
  • CMC delta connection cascade multilevel converter
  • a power conversion device wherein the power conversion device outputs a normal-phase reactive current and a negative-phase current at the same time, thereby causing a positive-phase reactive current and a negative-phase current due to another unbalanced load linked to the power system.
  • the power converter device which has the function which cancels out roughly is provided.
  • the present invention links a delta connection cascade multilevel converter (CMC) configured by delta connection of a series body of a cluster and a reactor, which is a series body of one or a plurality of unit cells, to a power system. It is a power conversion device, and provides a power conversion device having a function of balancing the voltage across the DC capacitor of each unit cell.
  • CMC delta connection cascade multilevel converter
  • the present invention links a delta connection cascade multilevel converter (CMC) configured by delta connection of a series body of a cluster and a reactor, which is a series body of one or a plurality of unit cells, to a power system.
  • CMC delta connection cascade multilevel converter
  • the phase angle of the positive phase component of the voltage of the power system is ⁇ 1
  • the effective value and the phase angle of the negative phase current command value or the actual negative phase current of the power converter are I2 and ⁇ 2, respectively.
  • a power converter having a function of flowing a circulating current in which each cluster has an effective value I0 and a phase angle ⁇ 0 expressed by the following equations is provided.
  • the present invention links a delta connection cascade multilevel converter (CMC) configured by delta connection of a series body of a cluster and a reactor, which is a series body of one or a plurality of unit cells, to a power system.
  • CMC delta connection cascade multilevel converter
  • the effective value and phase angle of the positive phase component of the voltage of the power system are V1, ⁇ 1, respectively
  • the effective value and phase angle of the in-phase component are V2, ⁇ 2, and the command value of the current flowing through the cluster.
  • each cluster is approximately expressed by the following equation.
  • the present invention provides a power converter having a function of outputting a circulating current having an effective value I0 and a phase angle ⁇ 0.
  • I0 ⁇ (I1 ⁇ V2 ⁇ cos ( ⁇ 1- ⁇ 2) + I2 ⁇ V1 ⁇ cos ( ⁇ 2- ⁇ 1)) / (V1 ⁇ cos ( ⁇ 0 ⁇ 1) + V2 ⁇ cos ( ⁇ 0 ⁇ 2))
  • ⁇ 0 tan ⁇ 1 ((I1 ⁇ V2 ⁇ (V1 ⁇ sin ( ⁇ 1 + ⁇ 1- ⁇ 2) + V2 ⁇ sin ( ⁇ 1-2 ⁇ ⁇ 2)) ⁇ I2 ⁇ V1 ⁇ (V2 ⁇ sin ( ⁇ 2 + ⁇ 2) - ⁇ 1) + V1 ⁇ sin ( ⁇ 2-2 ⁇ ⁇ 1))) / (I1 ⁇ V2 ⁇ (V1 ⁇ cos ( ⁇ 1 + ⁇ 1- ⁇ 2) + V2 ⁇ cos ( ⁇ 1-2 ⁇ ⁇ 2 ))-I2 ⁇ V1 ⁇ (V2 ⁇ cos ( ⁇ 2 ⁇ 2 + ⁇ 1) ⁇ V1 ⁇ cos ( ⁇ 2-2 ⁇ 2))-I2 ⁇ V1
  • a power converter power conversion characterized by using a moving average calculation using a half period of the system frequency or an integer multiple thereof as a time window for detecting V1, ⁇ 1, V2, ⁇ 2, I1, ⁇ 1, I2, and ⁇ 2.
  • a device is provided.
  • the voltages and currents of the three clusters are orthogonal to each other in a state where a normal-phase reactive current and a negative-phase current are simultaneously flowing in each cluster. Therefore, active power does not flow into each cluster.
  • a power conversion device including three series bodies of a cluster and a reactor, which is a series body of one or a plurality of unit cells, a positive-phase reactive current and a negative-phase current of an unbalanced load are used. Compensation becomes possible.
  • Delta connection CMC-STATCOM main circuit diagram Full-bridge unit cell. Control block diagram. Compensation current command value calculator. Feedforward calculator. Cluster balance control unit. The waveform example by this invention. Reverse-phase voltage compatible feedforward calculator. A control block that uses real current. A feedforward calculator that uses real current.
  • compensation of the positive-phase reactive current and the negative-phase current of an unbalanced load is performed using a power conversion device including three series bodies of clusters and reactors that are series bodies of one or a plurality of unit cells. Is possible.
  • the power conversion apparatus 102 connected to the power system 101 includes three reactors 103, a uv phase cluster 104, a vw phase cluster 105, and a wu phase cluster 106.
  • the uv, vw, and wu phase clusters 104 to 106 are not distinguished and may be simply referred to as clusters.
  • a reactor 103 is connected in series to each of the clusters 104 to 106.
  • One end of the series body of the uv phase cluster 104 and the reactor 103 is connected to the u phase of the power system, and the other end is connected to the v phase.
  • One end of the series body of the vw phase cluster 105 and the reactor 103 is connected to the v phase of the power system, and the other end is connected to the w phase.
  • One end of the series body of the wu phase cluster 106 and the reactor 103 is connected to the w phase of the power system, and the other end is connected to the u phase.
  • Each of the clusters 104 to 106 is a serial body of one or a plurality of unit cells 107.
  • N unit cells are connected to each cell.
  • the first cell and the second cell are numbered from the side closer to the reactor 103 and are called.
  • the internal configuration of the unit cell 107 will be described later.
  • An unbalanced load 108 is connected to the power system 101.
  • the unbalanced load 108 draws all or any combination of the positive phase active current, the positive phase reactive current, and the negative phase current from the power system 101.
  • phase voltage of the power system 101 is VSu, VSv, VSw.
  • the line voltage of the electric power system 101 is assumed to be VSuv, VSvw, VSwu.
  • the output voltages (cluster voltages) of the clusters 104 to 106 are Vuv, Vvw, and Vwu, respectively.
  • the DC voltage of the unit cell included in each of the clusters 104 to 106 is VCij.
  • the unit cell 107 is a single-phase full-bridge circuit including an x-phase upper element 201, an x-phase lower element 202, a y-phase upper element 203, a y-phase lower element 204, and a DC capacitor 205.
  • each of the elements 201 to 204 is illustrated with an IGBT symbol. Any switching element that can be turned on / off, such as a transistor (MOSFET), can be used in place of the IGBT.
  • MOSFET transistor
  • the cluster voltages Vuv, Vvw, and Vwu can be controlled by performing Pulse-Width Modulation (PWM) control on each unit cell.
  • PWM Pulse-Width Modulation
  • FIG. 3 is a diagram showing a control block in the control device not shown in FIG.
  • the control device detects the line voltages VSuv, VSvw, VSwu of the electric power system 101, and performs positive phase dq conversion to obtain the positive phase d axis voltage Vd and the positive phase q axis voltage Vq. Further, the control device detects currents Iuv, Ivw, and Iwu flowing through the reactor, and performs positive-phase dq conversion on these to obtain a positive-phase d-axis current Id1 and a positive-phase q-axis current Iq1.
  • control device detects currents Iuv, Ivw, and Iwu flowing through the reactor, and performs anti-phase dq conversion to obtain anti-phase d-axis current Id2 and anti-phase q-axis current Iq2.
  • the obtained Vd, Vq, Id1, Iq1, Id2, and Iq2 are supplied to the current controller 308.
  • the positive phase d-axis current command value Id1 * and the other current command values Iq1 * , Id2 * , Iq2 * are given in different ways.
  • the positive phase d-axis current command value Id1 * is given from the total average DC voltage control unit 303.
  • the normal phase q-axis current command value Iq1 * , the negative phase d-axis current command value Id2 * , and the negative phase q-axis current command value Iq2 * are currents of unbalanced loads 108 (hereinafter referred to as load currents) ILu, ILv, ILw. From the compensation current command value calculation unit 305. The internal configuration of the compensation current command value calculation unit 305 will be described later.
  • LPF low-pass filter
  • the average value calculator 302 calculates the average value (hereinafter referred to as cluster average DC voltage) VCu, VCv, VCw of the DC voltage in each cluster as shown in the following equation.
  • VCuv (VCuvf1 + VCuvf2 + ... + VCuvfN) / N
  • VCvw (VCvwf1 + VCvwf2 + ... + VCvwfN) / N
  • VCwu (VCwuf1 + VCwuf2 +...
  • the positive phase d-axis current command value Id1 * is calculated by multiplying the voltage control gain 304, and this is supplied to the current controller 308.
  • the feedforward computing unit 310 sets the effective inflow / outflow of each of the clusters 104 to 106 to zero based on the negative phase d-axis current command value Id2 * , the negative phase q-axis current command value Iq2 *, and the system voltages VSuv, VSvw, VSwu.
  • the circulating current command value feedforward term I0FF * is calculated.
  • the cluster balance control unit 311 calculates a circulating current command value feedback term I0FB * used for cluster balance control from the cluster average DC voltages VCuv, VCvw, VCwu and the total average DC voltage VC. Accordingly, the cluster balance control unit 311 provides a function of balancing the DC voltage of each unit cell.
  • the internal configuration of the cluster balance control unit 311 will be described later.
  • the circulating current control unit 312 compares the circulating current command value feedforward term I0FF * and the circulating current command value feedback term I0FB * (I0FF * + I0FB * ) with the actual circulating current I0, and multiplies the circulating current control gain 313.
  • the zero phase voltage command value V0 is calculated.
  • the cluster voltage command values Vuv * , Vvw * , and Vwu * are obtained by adding the obtained V0 to the cluster voltage command values Vuvcc * , Vvwcc * , and Vwcc * from the current controller.
  • Compensation current command value calculation unit 305 detects load currents ILu, ILv, and ILw, and outputs positive phase d-axis current ⁇ ILd1> and positive phase q-axis current ⁇ ILq1 via positive-phase dq conversion block and moving average calculator 401. > Is calculated. Further, from the ILu, ILv, and ILw, the negative phase d-axis current ⁇ ILd1> and the negative phase q-axis current ⁇ ILq1> are calculated via the negative phase dq conversion block and the moving average calculator 401.
  • the time window of the moving average calculator 401 is a half cycle of the system or an integer multiple thereof.
  • ⁇ ILd1> ⁇ ILq1>, ⁇ ILd2>, and ⁇ ILq2>, three except ⁇ ILd1> cause a voltage drop in the reactance component of the power system 101 that is not shown in the upper impedance.
  • the positive phase q-axis current ⁇ ILq1> of the load changes the amplitude of the system voltage.
  • the antiphase d-axis and q-axis currents ⁇ ILd2> and ⁇ ILq2> of the load increase the system voltage unbalance rate. Therefore, it is desirable to output a current having an opposite phase to ⁇ ILq1>, ⁇ ILd2>, and ⁇ ILq2> from the power conversion device 102 to suppress a change in system voltage amplitude and an increase in the unbalance rate.
  • the feedforward computing unit 310 calculates the effective value of the negative phase current from the magnitude and the angle of the vector [Id2 * , Iq2 * ] of the given current command values Id2 * , Iq2 * via the orthogonal coordinate / polar coordinate conversion block 501. I2, the positive phase current phase angle ⁇ 2 is obtained.
  • the feedforward computing unit 310 performs reverse phase dq conversion on the phase voltages VSu, VSv, and VSW of the power system 101 using the normal phase dq conversion block 306, and further converts the system half cycle to time through the moving average calculator 401.
  • the moving average of the windows is calculated to obtain the positive phase d-axis voltage ⁇ Vd1> and the positive phase q-axis current ⁇ Vq1>.
  • the normal phase voltage effective value V1 and the negative phase voltage phase angle ⁇ 1 are obtained from the magnitude and declination of the vector [ ⁇ Vd2>, ⁇ Vq2>] via the orthogonal coordinate / polar coordinate conversion block 501.
  • the feedforward computing unit 310 is not necessarily the same algorithm as the block shown in FIG. 4, but can output other mathematical algorithms as long as it can output signals mathematically equivalent to [Equation 7] to [Equation 10]. Can also be adopted.
  • the cluster balance control unit 311 calculates ⁇ VCuv, ⁇ VCvw, ⁇ VCwu which are differences between the given total average DC voltage VC and the cluster average DC voltages VCuv, VCvw, VCwu.
  • the obtained ⁇ VCuv, ⁇ VCvw, ⁇ VCwu are ⁇ converted using the ⁇ conversion block 601 to obtain [ ⁇ VC ⁇ , ⁇ VC ⁇ ] as vectors on the ⁇ axis.
  • the magnitude [Delta] VC and the declination [xi] of the vector [[Delta] VC [alpha], [Delta] VC [beta]] are calculated via the orthogonal coordinate / polar coordinate conversion block 602.
  • the cluster balance control unit 311 converts the vector [Vd, Vq] of the positive phase d-axis voltage Vd and the positive phase q-axis voltage Vq from the given vector [Vd, Vq] via the orthogonal coordinate / polar coordinate conversion block 501. Is calculated, that is, the phase angle of the system uv phase line voltage.
  • FIG. 7 is a schematic waveform of each part when the control according to the present invention is performed. From the top, the schematic waveform of the line voltage VSuv, VSvw, VSwu of the power system 101, the current flowing through the reactor 103 and each of the clusters 104 to 106 is shown. Schematic waveform of Iuv, Ivw, Iwu, schematic waveform of circulating current (I0FF + I0FB), schematic waveform of DC voltage VCuvj, VCvwj, VCwuj, schematic waveform of DC voltage VCuvfj, VCvwfj, VCwufj observed through LPF 301. FIG. 7 is drawn assuming that the circulating current command value I0 ideally follows the command value (I0FF * + I0FB * ).
  • the horizontal axis in FIG. 7 is time or phase angle
  • the vertical axis represents voltage or current amplitude in arbitrary units (arbitrary unit: a.u.).
  • the circulating current I0 flows.
  • the zero-phase feedback term I0FB * plays a role of suppressing the occurrence of DC voltage imbalance caused by variations in the characteristics of components used.
  • each of the clusters 104 to 106 is connected to the power system 101 via the reactor 103.
  • the present invention is also applicable to the case where each of the clusters 104 to 106 is connected to the power system 101 via a transformer instead of the reactor 103.
  • the present invention can also be applied to the case where each of the clusters 104 to 106 is connected to the power system 101 via the reactor 103 and the transformer.
  • the reverse-phase current command values Id2 * and Iq2 * are given to the feedforward calculator 310.
  • actual reverse phase currents Id2 and Iq2 are given instead of Id2 * and Iq2 * .
  • the difference between the first embodiment and the second embodiment is a control block and a feedforward computing unit. Therefore, hereinafter, the control block and the feedforward computing unit according to the second embodiment will be described with reference to FIGS. 8 and 9.
  • the feedforward computing unit 801 performs reverse-phase dq conversion of the currents Iuv, Ivw, and Iwu using the anti-phase dq conversion block 307, and further calculates a moving average using the system half cycle as a time window via the moving average calculator 401. Then, the negative phase d-axis current ⁇ Id2> and the negative phase q-axis current ⁇ Iq2> are obtained. Furthermore, the effective value I2 and the phase angle ⁇ 2 of the antiphase current are obtained from the magnitude and the declination of the vector [ ⁇ Id2>, ⁇ Iq2>] via the orthogonal coordinate / polar coordinate conversion block 501.
  • the feedforward computing unit 801 uses the positive phase dq conversion block 306 to perform the negative phase dq conversion on the phase voltages VSu, VSv, and VSw of the power system 101, and further converts the system half cycle to the time through the moving average calculator 401.
  • the moving average of the windows is calculated to obtain the positive phase d-axis voltage ⁇ Vd1> and the positive phase q-axis current ⁇ Vq1>.
  • the normal phase voltage effective value V1 and the negative phase voltage phase angle ⁇ 1 are obtained from the magnitude and declination of the vector [ ⁇ Vd2>, ⁇ Vq2>] via the orthogonal coordinate / polar coordinate conversion block 501.
  • I0 -I2
  • ⁇ 0 2 ⁇ ⁇ 1- ⁇ 2
  • the sine wave generator 502 generates a circulating current command value feedforward term I0FF * as a sine wave signal having an effective value I0 and a phase angle ⁇ 0.
  • the inflow / outflow effective power of each of the clusters 104 to 106 is reduced to zero as in the first and second embodiments. The effect that it can be made.
  • the third embodiment is characterized in that the feedforward computing unit 801 shown in FIG. 9 of the second embodiment is replaced with a negative-phase voltage-compatible feedforward computing unit 1001 shown in FIG.
  • the negative-phase current-compatible feedforward calculator 1001 converts the currents Iuv, Ivw, and Iwu into the positive-phase d-axis current ⁇ Id1> and the positive-phase q-axis current ⁇ Iq1 via the positive-phase dq conversion block 306 and the moving average calculator 401. > To get. Furthermore, the positive phase current effective value I1 and the positive phase current phase angle ⁇ 1 are obtained from the magnitude and declination of the vector [ ⁇ Id1>, ⁇ Iq1>] via the orthogonal coordinate / polar coordinate converter 501.
  • the negative-phase current-compatible feedforward calculator 1001 converts the currents Iu, Iv, and Iw into the negative-phase d-axis current ⁇ Id2> and the negative-phase q-axis current ⁇ Iq2 via the negative-phase dq conversion block 307 and the moving average calculator 401.
  • an anti-phase current effective value I2 and an anti-phase current phase angle ⁇ 2 are obtained from the magnitude and declination of the vector [ ⁇ Id2>, ⁇ Iq2>] via the orthogonal coordinate / polar coordinate converter 501.
  • the negative-phase current-compatible feedforward calculator 1001 converts the voltages VSuv, VSvw, and VSwu into the positive phase d-axis voltage ⁇ Vd1> and the positive phase q-axis voltage ⁇ Vq1 via the positive phase dq conversion block 306 and the moving average calculator 401. > To get. Furthermore, the positive phase voltage effective value V1 and the positive phase voltage phase angle ⁇ 1 are obtained from the magnitude and declination of the vector [ ⁇ Vd1>, ⁇ Vq1>] via the orthogonal coordinate / polar coordinate converter 501.
  • the negative-phase current compatible feedforward computing unit 1001 converts the voltages VSuv, VSvw, and VSwu into the negative-phase d-axis voltage ⁇ Vd2> and the negative-phase q-axis voltage ⁇ Vq2 via the negative-phase dq conversion block 307 and the moving average calculator 401, respectively. > To get. Furthermore, the positive phase voltage effective value V2 and the positive phase voltage phase angle ⁇ 2 are obtained from the magnitude and declination of the vector [ ⁇ Vd2>, ⁇ Vq2>] via the orthogonal coordinate / polar coordinate converter 501.
  • the inventors have determined that the circulating current command value feedforward term I0FF * having the effective value I0 and the phase angle ⁇ 0 expressed by the following equation is the circulating current even when the voltages VSuv, VSvw, and VSwu contain a reverse phase component. It has been found that the inflow / outflow effective power of each cluster can be made zero by giving it to the control unit 312.
  • I0 ⁇ (I1 ⁇ V2 ⁇ cos ( ⁇ 1- ⁇ 2) + I2 ⁇ V1 ⁇ cos ( ⁇ 2- ⁇ 1)) / (V1 ⁇ cos ( ⁇ 0 ⁇ 1) + V2 ⁇ cos ( ⁇ 0 ⁇ 2))
  • ⁇ 0 tan ⁇ 1 ((I1 ⁇ V2 ⁇ (V1 ⁇ sin ( ⁇ 1 + ⁇ 1- ⁇ 2) + V2 ⁇ sin ( ⁇ 1-2 ⁇ ⁇ 2)) ⁇ I2 ⁇ V1 ⁇ (V2 ⁇ sin ( ⁇ 2 + ⁇ 2) - ⁇ 1) + V1 ⁇ sin ( ⁇ 2-2 ⁇ ⁇ 1))) / (I1 ⁇ V2 ⁇ (V1 ⁇ cos ( ⁇ 1 + ⁇ 1- ⁇ 2) + V2 ⁇ cos ( ⁇ 1-2 ⁇ ⁇ 2 ))-I2 ⁇ V1 ⁇ (V2 ⁇ cos ( ⁇ 2 ⁇ 2 + ⁇ 1) ⁇ V1 ⁇ cos ( ⁇ 2-2 ⁇ 2))-I2 ⁇ V1
  • the feedforward computing unit 1001 can output signals mathematically equivalent to [Equation 14] and [Equation 15], even if the algorithm is not completely the same as the block shown in FIG. It is also possible to adopt the algorithm.
  • each of the clusters 104 to 106 is connected to the power system 101 via the reactor 103.
  • the present invention is also applicable to the case where each of the clusters 104 to 106 is connected to the power system 101 via a transformer instead of the reactor 103.
  • the present invention can also be applied to the case where each of the clusters 104 to 106 is connected to the power system 101 via the reactor 103 and the transformer.
  • DESCRIPTION OF SYMBOLS 101 Electric power system, 102 ... Power converter, 103 ... Reactor, 104 ... uv phase class, 105 ... vw phase cluster, 106 ... wu phase cluster, 107 ... Unit cell, 201 ... X phase upper side element, 202 ... Under x phase Side element 203 ... y phase upper element 204 ... y phase lower element 205 ... DC capacitor 301 ... low pass filter (LPF) 302 ... average value calculator 303 ... all average dc voltage controller 304 ... all Average DC voltage control gain, 305 ... compensation current command value calculation unit, 306 ... normal phase dq conversion block, 307 ...
  • LPF low pass filter

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
PCT/JP2011/058567 2010-04-13 2011-04-05 電力変換装置 Ceased WO2011129223A1 (ja)

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JP2016123159A (ja) * 2014-12-24 2016-07-07 株式会社東芝 電力変換装置
US10218285B2 (en) 2015-10-19 2019-02-26 Siemens Aktiengesellschaft Medium voltage hybrid multilevel converter and method for controlling a medium voltage hybrid multilevel converter
JP2019140743A (ja) * 2018-02-07 2019-08-22 富士電機株式会社 電力変換装置
JP7040077B2 (ja) 2018-02-07 2022-03-23 富士電機株式会社 電力変換装置

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